A Case Study of Space Frame Member's Deflection at the Addis Ababa International Airport
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Date
2010-09
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Addis Ababa University
Abstract
Space frame structures are nowadays widely used in large span and short span
structures. The case of assembly and simplicity has made such structures popular
particularly in public buildings, including airports. Addis Ababa International Airport
Ethiopia Passengers Terminal is one of such building in Ethiopia. Despite their
simplicity however, space frame structure have been noted to exhibit failure.
Some of the failure of space frame traced back to inaccuracy in assembling,
design and material property.
This thesis is concerned with the deflection analysis of Addis Ababa International
Airport Ethiopia Passengers Terminal. The method of assembly or erection of
AAIAEPT depends on space frame behavior of load transmission and construction
details. Scale of the structure, method of jointing, strength and rigidity are the
objective function of deflection problems. The module dimension, depth and
jointing system have been taken as design variables. Laboratorial research is not
performed on the material property of member.
Deflection analysis has been carried out on geometrical and material non-linearity.
Factors influence load carrying capacity, data for analysis and confirmation of
theoretical values have been calculated. Using this data redesigning has been
made. The relationships between temperature and deflection are presented
graphically to show the performance of the structure.
The analysis results are found to be in agreement with some of the approximate
analysis models except joint rigidity and temperature. The carrying capacity of
AAIAEPT space frame is on the safe or conservative side.
Finally, propose possible procedures that will help to stop further deformation and
provide recommendation on certain precaution to be taken during space frame
design and construction. Provide proposals as curative measures to be taken
based on the findings.
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Civil Engineering